Method of making belts



Nov. 24, 1925.

A. FREEDLANDER ETv Al.

METHOD 0F MAKING BELTS OriginalFiled-April 2. 1923 2 Sheets-Sheet l /lvvENroRs l bra'z'aml/ J. Head/Moden coda/15m,

Nev. 24,1925. 1,562,548

A. L. FREEDLANDER ET AL METHOD OF MAKING BELTS.,

Original Filed April 2. 1923 2 Sheets-Sheet 2 n l gn, :55%. n? I l GMW i Patented Nov. 24, 1925.

- UNITED-STATES PATENT orricr.

ABRAHAM L. FREEDLANDER AND WILLIAM Gr. GOODW' TO THE RUBBER DEVELOPMENT COMEANY, OF DAYTON, OHIO, .A TRUST ESTATE.

METHOD F MAKING BELTS.

Original application `ied April 2, 1923, Serial No. 629,255. Divided and this application filed March 3,

192.4. Serial No. 696,470.

To all whom t may concern:

Be it known that we, ABRAHAM L. FiiEED- LANDER and WILLIAM G. GoonwiN, citizens of the United States, residing at Dayton, in

the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Methods ,of Making Belts,

of which the following is a specification, reference being had therein to the accompanying drawing.

Our invention relates to the method of making belts, and is a 'division of our application led April 2, 19,23, Ser..No. 629,255.

The object of ourv invention is to provide a method of making a fan belt which will have long life and durability, with sufficient resiliency and a capacity to stand abuse and wear and the deteriorating effects of mud, water, and oil.

It is the particular object of our invention to provide a method of making a belt adapte for use with V-shaped pulleys on automotive equipment. U

It is the object of our inventiorrto provide a method of making a composite belt which `may be assembled from a plurality of separate sections. These sections may be cut for the purpose vof forming this belt, or may be waste from forming larger belts of a dlfferent construction.

It is our object to rovide a method of producing a belt in w ich the several sections will tenaciously adhere to one another, which will withstand the. abrasive effect ofthe pulleys on which it is mounted, will closely engage `with such pulleys, and which will have such yielding surfaces as will provide proper compression areas to yieldingly take up the strains and stresses to which such structures' are subjected.

Referring to the drawings: p

Figure l is a section showing the production of the segments which later compose the belt of our invention, in a case when such segments are otherwise waste material from the production of belts lof different construction.

Figure 2 is an enlarged section of a typical segment or unit composing the belt.

Figure 3 is al section through such a segy of different sizes of belts ment as applied on the assembly mandrel in the first step of the assembly.

Figure 4 is a similar step of the assembly.

Figure 5 is a similar section showing the application of the second segment or unit to compose the belt.

Figure 6 is the next step in the assembly of the components of the belt. Figure 7 is the final step.

Figure 8 is a sectionv enlarged, showing the composite bel Figure 9 is a section through a vulcanizing equipment, illustrating the arrangement being subjected to a second vulcanization.

Referring to the drawings in detail:

l is a metal drum on which there is mounted a cutting pad 2. Upon this cutting pad 2 is mounted a cylinder of belt stock. This cylinder of belt stock is composed Aof the following successive layers, inthe order enumerated, reading inwardly toward the IN, 0F DAYTON, OHIO, .ASSIGNORS section in the second outside of the stock as mounted on the drum.

The first component of this stock is a layer of stiiieX, containing libre preferably, designated 3. This material is a very still rubber compound. Mounted upon the stiflex 3 are three layers of rubberized cords which are Ifilesignated 4. These cords lare parallel to the main axis of the segment or section, and run around through the section, forming a backbone for it. The rubber which is intermingled with and inter osed between the cords is designated 5. libunted on the rubberized cords is a red rubber cushion 6. Upon the cushion are mounted three layers of rubberized fabric, the textile portion of which is designated 7 and the rubber por- Y sections-- We take these triangular segments or sections B which come oft' of the metal cutting drum in rings, and assemble them in the following manner,- thus securing not onl a saving of the waste, but a belt of new an durable characteristics not heretofore obtainable. v

We select an assembly mandrel such as shown in Figure 3 in section, which is coinposed of a ledge or shoulder 10, having 'a downwardly tapering surface 11. The main body of the mandrel is designated 12. The

. ,broad base of one of these 'segments B is mounted on the wa-ll 13 of the main body 12 of the assembly mandrel. It is then forced downwardly so that itlies closely adjacent to the surface 11 of the shoulder 10, and a layer of, preferably, white rubber, acting as a bond or cement, designated 14, is placed thereon, asin Figure 5. This cement, has

superimposed upon it a second segment By havingfits sharp point adjacent `the wall 13 of the mandrel 12. This whole structure is then removed fromthe mandrel and reversed in Kosition, as in Figure 6.

thirdA segment B is tben cemented in position, so that the outer sections have the stiiex portions on the same side of the belt with the fabric portion of the middle section interposed therebetween, It will also be noted that the stiflex portion 3 of the middle section is interposed between the fabric portions on either side thereof of the outside WeV thus have a belt which'has a compression or yielding member, which is the stiicx portion of the center section on the inner surface of the belt, which ,is subjected to considerable compression, while this yielding section is protected by the fabric sections, and by fabric with intermingled cord and fabric portions. vThe several sections are. bonded together by the bond or cement of white rubber 11i, and have cushion members to absorb the compression, distributing it through the structure, in the form of the red rubber cushion 6.

It will also be noted that the rubberized cord medium is centrally located and so `arranged as to form the backbone of the belt.

After the production of such a composite belt, the belt is inserted in a vulcanizing apparatus, and subjected to a temperature of approximately three hundred (300) degrees Fahrenheit, for. approximately thirty (30) minutes.

In Figure 9 is shown in section a typical equipment of this character, in which there are aplurality of' vulcanizing chambers composed of the lower half 15 and the upper half 16, located with respect to one another by the dowel pins 17. Inl-these halves, cavities 18 are provided fornthe reception of the belts. These cavities are concentric with one another, so that belts of different sizes and diameters may be accommodated in the same apparatus. These several sets of apparatus are piled one on the other, and retained together by a clamp or strap 19 in any desired-manner.

Steam is applied through the vent 20 for the application ofthe suitable heat for the second vulcanization.

It is sometimes desirable to apply the cement to the side walls of the sections, and then stretch upon a form under heat, to bring all the sections to be assembled together to a uniform size,after which the white rubber bondcan be applied.

It will be thus seen that our process. consists of the following steps:

(l) Previding the vulcanized stock.

(2) Cutting the stock to form segments or rings triangular in section.

(3) Cementing the side walls of the sections.

(4.-) Stretching under heat on brin the sections to size.

(5 Applying white rubber either sideof the center section. d (6) Placing the center section on a manrel.

sheets on position to' the center section.

(8) Removing the assembly and replacing it on the mandrel. v

(9) Placing the final section on the other side of the center section.

(l0) Placing ina mold and curing. j

lVe desire to comprehend within our invention suitable modifications of the process of manufacturing our belt, which may be fairly comprehended within the scopo of our invention, as such process may be modified from time to time to adapt the invention to varying conditionsA and demands. For instance, in place of the stifiex we may use fabric layers in place thereof, preferably embedded in rubber.

Having thus fully described our invention, what we claimv as new and desire to secure by Letters Patent is z- 1. In a method of manufacturing a belt, placing a cylinder of belt material on a cutting drum, cutting the material into annular 2. In a method of manufacturing a belt,

placing a cylinder of belt material on a cutting drum, cutting the material into annular members triangular in section, placing one of vs uch sections on a mandrel, cementin in reverse position a second section to the rst (7) Applying a side section in reverse one while on the mandrel, removing the two sections from the mandrel and reversing in position, applying a third section in` reverse position to the first section on the side opposite to the second section, removing from the mandrel, and placing said cemented sections in a vulcanizing apparatus, and "vulcanizing,

3. In a method of manufacturing a belt, mounting a vulcanized cylinder'of belt material' on a cutting drum, cutting triangularshaped annular sections from saidnmaterial, applying cement to the side walls of said material, stretching said sections to size on a form under heat, joining said sections to one another with the apex of one triangular section between the bases of the adjoining sections, and Vulcanizing the assembled sectionsas a unit to form a belt.

V4:. In a method of manufacturing a belt, providing a cylinder of vulcanized belt Inaterial, cutting said material into sections of annular form triangularin cross-section, applying cement to the sidewalls of said annular sections, stretching said sections under heat on a form to bringthem to size, applying sheets of rubber on either side of some of said sections to form a binder with adjacent sections, assembling three of said sectionsso that the apex of one of them is inter osed between the bases of the other two, an vulcanizing said assembled sections to form a completed belt.

In testimony whereof, we aiix our signatures.

ABRAHAM L. FREEDLANDER.

WILLIAM G. GOODWIN. 

